JP4656922B2 - How to finish building interior surfaces - Google Patents

Description

  The present invention relates to a paint finishing method for building interior surfaces.

In recent years, interest in comfortable living spaces has increased. In this regard, in the surface finishing of interior surfaces such as walls and ceilings, there is an increasing expectation for a humidity control finish capable of exhibiting effects such as prevention of condensation, prevention of mold generation, and suppression of discomfort by adjusting humidity.
For example, Japanese Examined Patent Publication No. Sho 62-15108 (Patent Document 1) discloses that an interior surface is coated using a humidity control coating material containing a synthetic resin emulsion having a specific particle size and diatomaceous earth as essential components. Yes. Japanese Patent Application Laid-Open No. 11-106681 (Patent Document 2) discloses a method of applying a breathable water-repellent paint composed of colloidal silica, a silane water repellent, a synthetic resin emulsion, etc. on the surface of a diatomaceous earth member. Has been.

By the way, in recent years, in the indoor environment, the sick house problem and the like have been socially raised, and prevention of diffusion of various harmful gases is demanded. Examples of such harmful gases include formaldehyde, ammonia, hydrogen sulfide, methyl mercaptan, trimethylamine and the like. In the above-mentioned patent document, a moisture absorbing / releasing material such as diatomaceous earth is used. Such moisture-absorbing / releasing materials are also known to have a certain level of harmful gas adsorption performance and can be expected as effective components for improving the indoor environment.
However, in the interior finishing according to the above-mentioned patent document, when the adsorption performance of the moisture absorbing / releasing material reaches a saturated state, no more harmful gas can be adsorbed, and the adsorption effect is limited. Moreover, the harmful gas once adsorbed may be released into the indoor space again. Such re-release of the harmful gas hinders improvement of the indoor environment.

Japanese Examined Patent Publication No. 62-15108 JP 11-106681 A

  The present invention has been made in view of the above-described problems, and has an excellent humidity conditioning performance, harmful gas adsorption / decomposition performance, and can further suppress the release of harmful gases. The purpose is to obtain a finishing method.

As a result of intensive studies to achieve the above object, the present inventor applied a moisture absorbing / releasing coating material that forms a coating film with a moisture absorption / release amount of 60 g / m ² or more on the base material of the building interior surface. In order to complete the present invention, a method of applying a moisture-permeable coating material that includes at least a chemical substance adsorbent and a photocatalytic substance and forms a coating film having a water vapor permeability of 100 g / m ² · 24 h or more is provided. It came.
That is, the present invention has the following characteristics.

1. After applying a moisture absorbing / releasing coating material that forms a coating film with a moisture absorption / release amount of 60 g / m ² or more to the base material of the interior surface of the building, the binder is 100 parts by weight in terms of solid content and the average particle size is 0 100 to 4000 parts by weight of aggregate of 0.1 to 5 mm, 0.1 to 100 parts by weight of chemical adsorbent, and 0.1 to 50 parts by weight of photocatalytic substance , water vapor permeability of 100 g / m ² · 24 h or more A paint finishing method for an interior surface of a building, comprising applying a moisture-permeable coating material that forms a coating film having a thickness of 0.2 to 5 mm .
2. 1. The moisture-absorbing / releasing coating material contains 100 parts by weight of a binder in solid content and 20 to 2000 parts by weight of moisture-absorbing / releasing particles. The paint finishing method of the building interior surface described in 1.

Above 1. On the interior finish surface obtained by this method, most of the toxic gas is adsorbed and decomposed by the moisture-permeable coating film when absorbing moisture. Even if toxic gas passes through the moisture-permeable coating film and reaches the moisture-absorbing / releasing coating film, these are adsorbed and decomposed by the moisture-permeable coating film during moisture release. That is, the moisture permeable coating effectively acts as a harmful gas filter. Therefore, the above 1. According to the invention, it is possible to obtain an interior finish surface that has excellent humidity control performance, harmful gas adsorption / decomposition performance, and can suppress the re-release of the harmful gas.
2. In the present invention, by adopting a moisture-permeable coating material containing a binder, an aggregate of a specific particle size, a chemical adsorbent, and a photocatalyst substance in a specific ratio, the harmful gas adsorption / decomposition effect and the re-release suppression effect are achieved. It can be further enhanced.
3. above. In this invention, moisture-adjusting performance can be improved by adopting a moisture-absorbing / releasing coating material containing a binder and moisture-releasing / releasing particles in a specific ratio.

  Hereinafter, the best mode for carrying out the present invention will be described.

The moisture absorbing / releasing coating material in the present invention forms a coating film having a moisture absorption / release amount of 60 g / m ² or more, preferably 70 g / m ² or more, more preferably 100 g / m ² or more. By using such a hygroscopic coating material, a sufficient humidity control effect can be obtained in the indoor space. The upper limit of the moisture absorption / release amount is not particularly limited, but is usually 500 g / m ² or less (preferably 300 g / m ² or less).
In addition, the moisture absorption / release amount in the present invention is a value measured according to JIS A6909: 2003 “Finishing Finishing Coating Material” 7.32.

  The composition of the moisture-absorbing / releasing coating material is not particularly limited as long as it has the above-described moisture-absorbing / releasing performance. Is preferred. By adopting such a hygroscopic coating material, it is possible to obtain excellent humidity control performance.

As the binder, an organic resin is suitable. Examples of organic resins include water-soluble resins, water-dispersible resins, solvent-soluble resins, solvent-free resins, non-water-dispersed resins, various binders such as powder resins, or composites of these. can do. Among these, a water-dispersible resin (resin emulsion) is preferable in the present invention. As the water dispersible resin, those having an average particle diameter of more than 50 μm (preferably more than 80 μm, more preferably more than 100 μm) and less than 500 μm (preferably less than 400 μm, more preferably less than 300 μm) It is suitable in terms of performance. The average particle size of the water-dispersible resin is a value measured by a dynamic light scattering method. Specifically, as a dynamic light scattering measurement device, a microtrack particle size analyzer (for example, UPA150, Nikkiso Co., Ltd.) This is a value obtained by analyzing the detected scattering intensity by the Marquardt method of the histogram analysis method (measurement temperature is 25 ° C.).
Examples of organic resins that can be used as the binder include cellulose, polyvinyl alcohol, ethylene resin, vinyl acetate resin, polyester resin, alkyd resin, vinyl chloride resin, epoxy resin, acrylic resin, urethane resin, acrylic silicon resin, Examples thereof include a fluororesin and the like, or a composite system thereof, and an acrylic resin, a urethane resin, an acrylic silicon resin, a fluororesin, and the like are particularly preferable.

  Such an organic resin may have a property of causing a crosslinking reaction after the coating film is formed. When the organic resin in the moisture-absorbing / releasing coating material has cross-linking reactivity, various physical properties such as moisture-absorbing / releasing properties, water resistance, and chemical resistance can be enhanced. Specifically, as the crosslinking reaction, for example, carboxyl group and metal ion, carboxyl group and carbodiimide group, carboxyl group and epoxy group, carboxyl group and aziridine group, carboxyl group and oxazoline group, hydroxyl group and isocyanate group, carbonyl group and hydrazide group, A combination of an epoxy group and a hydrazide group, an epoxy group and an amino group, and the like can be given.

  When using organic resin as a binder, the glass transition temperature is -50-80 degreeC normally, Preferably it is -30-50 degreeC, More preferably, it is -20-30 degreeC. If the glass transition temperature is within such a range, flexibility is imparted to the coating film, and the followability to the substrate can be enhanced. In addition, the glass transition temperature in this invention is a value calculated | required by the formula of Fox from the kind of monomer which comprises organic resin, and its structural ratio.

Examples of the hygroscopic powder particles include boehmite, silica gel, zeolite, sodium sulfate, alumina, allophane, diatomaceous earth, siliceous shale, sepiolite, attabargite, montmorillonite, zonolite, imogolite, Otani stone powder, activated clay, charcoal, bamboo charcoal, Activated carbon, wood powder, shell powder, porous synthetic resin particles, etc. can be used. The average particle size of the hygroscopic powder is usually 0.001 to 1 mm, preferably 0.01 to 0.1 mm, more preferably 0.01 to 0.09 mm.
Such hygroscopic particles have a performance of a moisture absorption rate of 10% or more, preferably 20% or more at a temperature of 20 ° C. and a relative humidity of 90%. The moisture absorption rate at a temperature of 20 ° C. and a relative humidity of 90% is a constant temperature and constant temperature of 20 ° C. and a relative humidity of 90% after the sample is dried for 24 hours in a constant temperature and humidity chamber of a temperature of 20 ° C. and a relative humidity of 45%. It is a value obtained from a change in weight when moisture is absorbed in a humidifier for 24 hours. That is,
Moisture absorption rate (%) = {(weight after moisture absorption−weight after drying) / weight after drying} × 100

  The constituent ratio of the hygroscopic powder is usually 20 to 2000 parts by weight, preferably 100 to 1500 parts by weight, and more preferably 200 to 1000 parts by weight with respect to 100 parts by weight (solid content) of the binder. When the constituent ratio of the hygroscopic powder is too small, it becomes difficult to obtain sufficient humidity control performance. It is also disadvantageous in terms of fire resistance. When the constituent ratio of the hygroscopic powder is too large, the strength and flexibility of the coating film are insufficient.

Further, the hygroscopic coating material may contain an aggregate. The average particle diameter of the aggregate is usually 0.01 to 5 mm, preferably 0.05 to 2 mm, more preferably 0.1 to 1 mm. By using such an aggregate, the humidity control performance can be further enhanced. In addition, the average particle diameter of aggregate is a value obtained by performing sieving using a metal net sieve specified in JIS Z8801-1: 2000 and calculating the average value of the weight distribution.
The type of aggregate is not particularly limited, and any of natural products and artificial products can be used. Specifically, for example, heavy calcium carbonate, cold water stone, kaolin, clay, porcelain clay, china clay, talc, aluminum hydroxide, magnesium hydroxide, barite powder, quartz sand, gravel, glass beads, resin beads, metal particles, Alternatively, crushed products such as rocks, glass, ceramics, sintered bodies, concrete, mortar, plastic, rubber, and shells can be used. Colored ones can also be used.

The composition ratio of the aggregate is usually 50 to 2500 parts by weight, preferably 100 to 2000 parts by weight, and more preferably 300 to 1500 parts by weight with respect to 100 parts by weight (solid content) of the binder. When the aggregate ratio is too small, the effect of improving the humidity control performance cannot be obtained. When the aggregate ratio is too large, the aggregate is easily detached. Moreover, it becomes difficult to impart flexibility.
Note that the moisture absorption rate of the above-mentioned aggregate at a temperature of 20 ° C. and a relative humidity of 90% is usually less than 10%, preferably 3% or less.

  In addition to the above-mentioned components, the hygroscopic coating material includes, for example, pigments, fibers, plasticizers, antibacterial agents, antifungal agents, insecticides, flame retardants, crosslinking agents, antioxidants, ultraviolet absorbers, and the like. It may be.

The moisture-permeable coating material in the present invention forms a coating film having a water vapor permeability of 50 g / m ² · 24 h or more, preferably 70 g / m ² · 24 h or more, more preferably 100 g / m ² · 24 h or more. Further, the moisture-permeable coating material contains at least a chemical substance adsorbent and a photocatalytic substance as essential components. In the present invention, after applying the moisture-absorbing / releasing coating material described above, by applying and laminating such a moisture-permeable coating material, excellent humidity control performance and harmful gas adsorption / decomposition performance are obtained, Furthermore, the re-release of harmful gases can be sufficiently suppressed.
The upper limit of water vapor permeability in the moisture-permeable coating material is usually 2000 g / m ² · 24 h or less, preferably 1500 g / m ² · 24 h or less, more preferably 1000 g / m ² · 24 h or less. If the water vapor permeability is within such a range, it is preferable in terms of the adsorption / decomposability of toxic gas, re-release prevention, and the like.
The water vapor permeability in the present invention is a value measured according to JIS K5400: 1990 “Paint General Test Method” 8.17.

  The chemical substance adsorbent in the moisture-permeable coating material is an effective component for preventing the adsorption and re-release of harmful gases (for example, formaldehyde, ammonia, hydrogen sulfide, methyl mercaptan, trimethylamine, etc.). This chemical substance adsorbent is an essential component for the moisture-permeable layer to effectively act as a harmful gas filter. Examples of the chemical substance adsorbent include amine compounds, urea compounds, amide compounds, imide compounds, hydrazide compounds, azole compounds, azine compounds, layered phosphate compounds, and aluminosilicates. Among these, 1 or more types chosen from a layered phosphate compound and an aluminosilicate are suitable. The average particle size of such a chemical substance adsorbent is usually about 0.5 to 100 μm (preferably 1 to 50 μm).

Examples of the layered phosphate compound include layered zirconium phosphate, layered zinc phosphate, layered titanium phosphate, layered aluminum phosphate, layered magnesium phosphate, layered cerium phosphate, and the like. An amine compound is included in these layered phosphate compounds. Intercalated ones are preferred. Examples of the amine compound include methylamine, ethylamine, aniline, ethylenediamine, diethylenetriamine, triethylenetetramine, tetraethylenepentamine, pentaethylenehexamine, propylenediamine, dipropylenetriamine, and tripropylenetetramine.
Examples of the aluminosilicate include a composite oxide of at least one metal selected from zinc, copper, silver, cobalt, nickel, iron, titanium, barium, tin, and zirconium, and aluminum and silicon.

The photocatalytic substance in the moisture-permeable coating material is an effective component for preventing harmful gas decomposition and re-release. Furthermore, it also has the ability to decompose contaminants (such as tobacco dust) adhering to the coating film. Examples of the photocatalytic substance include TiO ₂ , ZnO, Bi ₂ O ₃ , BiVO ₄ , SrTiO ₃ , CdS, InP, InPb, GaP, GaAs, BaTiO ₃ , BaTiO ₄ , BaTi ₄ O ₉ , K ₂ NbO ₃ , Nb _{2. O 5, Fe 2 O 3,} Ta 2 O 5, Ta 3 N 5, K 3 Ta 3 Si 2 O 3, WO 3, SnO 2, NiO, Cu 2 O, SiC, MoS 2, RuO 2, CeO 2 or the like In addition, composites of these with metals, metal oxides, layered compounds and the like can be mentioned. The average particle size of such a photocatalytic substance is usually about 0.001 to 1 μm (preferably 0.01 to 0.5 μm).
In addition, it is better not to use a photocatalyst substance that has a photocatalyst substance supported on a hygroscopic particulate material because the photocatalytic action may be inhibited by moisture absorption.

In a moisture-permeable coating material, when only a chemical substance adsorbent is used without using a photocatalytic substance, the amount of harmful gas adsorbed is limited, and an effect exceeding the adsorption capacity cannot be expected.
On the contrary, when only the photocatalytic substance is used, in order to obtain the decomposition effect of the harmful gas, the constituent ratio of the photocatalytic substance must be increased sufficiently to increase the probability that the harmful gas contacts the photocatalytic substance. However, when the amount of the photocatalytic substance is increased, the binder is prematurely deteriorated. Further, there arises a problem that the color of the moisture-permeable coating material is limited or the cost is increased. That is, there is a practical limit to the increase in photocatalyst.
In the present invention, by using a chemical substance adsorbent and a photocatalyst substance in combination, practical performance can be obtained in the adsorption, decomposition and re-release prevention of harmful gas, and the harmful gas filter effect of the moisture-permeable coating film can be sufficiently obtained. It can be demonstrated.

  As the moisture-permeable coating material in the present invention, a material having a binder, an aggregate having an average particle diameter of 0.01 to 5 mm, a chemical substance adsorbent, and a photocatalytic substance as an essential component is suitable. By adopting such a moisture-permeable coating material, it is possible to further enhance the effect of harmful gas adsorption / decomposition and re-release suppression. Moreover, according to such a composition, since a thick film type coating material is obtained, various uneven | corrugated patterns can also be provided to the formed coating-film surface.

As the binder in the moisture-permeable coating material, an organic resin capable of forming a transparent film is suitable. As the organic resin, the same hygroscopic coating material can be used. When the organic resin in the moisture-permeable coating material has cross-linking reactivity, it is advantageous in terms of moisture permeability, water resistance, chemical resistance, etc., and the resistance to the photocatalytic substance can be increased.
When a water-dispersible resin is used as the organic resin in the moisture-permeable coating material, the average particle diameter is usually more than 50 μm (preferably more than 80 μm, more preferably more than 100 μm) and less than 500 μm (preferably less than 400 μm, more Preferably, it is less than 300 μm. When the average particle diameter is within such a range, it is possible to obtain an appropriate moisture permeability.
The glass transition temperature of the binder in the moisture-permeable coating material is usually −30 to 120 ° C., preferably −10 to 100 ° C., more preferably 0 to 80 ° C. When the glass transition temperature is within such a range, the stain resistance of the coating film surface can be enhanced.
Furthermore, the glass transition temperature of the binder in the moisture-permeable coating material can be set higher (preferably higher than 5 ° C, more preferably higher than 10 ° C) than the glass transition temperature of the binder in the moisture-absorbing / releasing coating material. desirable. By setting such a glass transition temperature, it is possible to improve the followability to the base material while ensuring contamination resistance, and to prevent the occurrence of cracks in the coating film. Specifically, the glass transition temperature of the binder in the hygroscopic coating material is −30 to 50 ° C., the glass transition temperature of the binder in the moisture permeable coating material is −10 to 100 ° C., and in the moisture permeable coating material. It is desirable to set the glass transition temperature of the binder to be 5 ° C. or more higher than the glass transition temperature of the binder in the hygroscopic coating material.

As the aggregate in the moisture-permeable coating material, one having an average particle diameter of 0.01 to 5 mm, preferably 0.05 to 2 mm, more preferably 0.1 to 1 mm is used. When the particle diameter of the aggregate is too small, the moisture permeability performance is lowered and the moisture absorption / release performance of the lower layer is inhibited. In addition, the finished appearance becomes a monotonous color. Furthermore, it becomes difficult for light to reach the photocatalytic component inside the moisture-permeable coating film, which is disadvantageous in terms of the harmful gas decomposition effect. When the particle diameter is too large, the surface unevenness becomes large, and it becomes difficult to obtain a coating film having a uniform thickness. About the kind of aggregate, the thing similar to the aggregate of a hygroscopic coating material can be used.
The composition ratio of the aggregate in the moisture-permeable coating material is usually 100 to 4000 parts by weight, preferably 300 to 3000 parts by weight, and more preferably 500 to 2000 parts by weight with respect to 100 parts by weight (solid content) of the binder. When the aggregate ratio is too small, the effect of adsorbing and decomposing noxious gas becomes insufficient, and the moisture absorption / release performance of the lower layer may be hindered. Moreover, it becomes difficult to increase the thickness of the moisture-permeable coating film, which is disadvantageous in terms of imparting design properties. When the aggregate ratio is too large, the aggregate is easily detached.

  The component ratio of the chemical substance adsorbent is usually 0.1 to 100 parts by weight, preferably 1 to 80 parts by weight, and more preferably 5 to 50 parts by weight with respect to 100 parts by weight (solid content) of the binder. When the composition ratio of the chemical substance adsorbent is too small, the harmful gas adsorption effect and the re-release prevention effect are insufficient. If the composition ratio of the chemical substance adsorbent is too large, there is a risk of adversely affecting the surface design and water resistance. Further, it is disadvantageous in terms of cost.

  The composition ratio of the photocatalytic substance is usually 0.1 to 50 parts by weight, preferably 0.5 to 30 parts by weight, and more preferably 1 to 20 parts by weight with respect to 100 parts by weight (solid content) of the binder. When the constituent ratio of the photocatalytic substance is too small, the harmful gas decomposition effect and the re-release prevention effect are insufficient. When the constituent ratio of the photocatalytic substance is too large, the binder is prematurely deteriorated. Moreover, it becomes easy to restrict | limit the color of a moisture-permeable coating material.

  In addition to the above-mentioned components, for example, pigments, fibers, plasticizers, antibacterial agents, insecticides, insecticides, flame retardants, crosslinking agents, antioxidants, ultraviolet absorbers, water repellents, etc. May be included.

The present invention is applied to interior finishing of buildings. Specifically, it can be applied to painting finishes on walls, partitions, doors, ceilings, etc. in houses, condominiums, schools, hospitals, stores, offices, factories, warehouses, restaurants, etc.
Applicable base materials include, for example, gypsum board, plywood, concrete, mortar, porcelain tile, fiber mixed cement board, cement calcium silicate board, slag cement perlite board, asbestos cement board, ALC board, siding board, extrusion board , Steel plate, plastic plate and the like. The surface of these base materials may have been subjected to some surface treatment (for example, a sealer, a surfacer, a filler, etc.), and has already been provided with a coating film, or has already been applied with wallpaper. Also good.

In the present invention, a hygroscopic coating material is first applied to such a substrate. As a method for applying the hygroscopic coating material, a known method can be employed, and for example, trowel coating, spray coating, roller coating, brush coating and the like are possible.
The thickness of the dry coating film can be appropriately set within a range in which the effect of the present invention can be exhibited, but is usually 0.2 to 5 mm (preferably 0.5 to 4 mm, more preferably 0.8 to 4 mm).
At the time of application, the viscosity of the coating material can be appropriately adjusted by diluting with water or the like. The dilution ratio is usually about 0 to 20% by weight.

After applying the hygroscopic coating material, the moisture-permeable coating material is applied and laminated. The moisture-permeable coating material is usually applied after the hygroscopic coating film is dried. As a method for applying the moisture-permeable coating material, a known method can be employed. For example, trowel coating, spray coating, roller coating, brush coating, and the like are possible.
What is necessary is just to set the thickness of the dry coating film of a moisture-permeable coating material suitably in consideration of humidity control performance, adsorption / decomposition performance of harmful gas, and the like. Usually, it is about 0.2-5 mm (preferably 0.5-4 mm, more preferably 0.8-4 mm).
At the time of application, the viscosity of the coating material can be appropriately adjusted by diluting with water or the like. The dilution ratio is usually about 0 to 20% by weight.
When a thick film type coating material is used as the moisture permeable coating material, patterning can be performed with a brush, a trowel, a roller or the like before the coating film is dried. By such patterning, various uneven patterns can be imparted to the coating film surface.

After applying the moisture-permeable coating material, a clear paint or water repellent can be applied as necessary. Among these, as the clear paint, a paint containing a silicone emulsion and a synthetic resin emulsion other than the silicone emulsion at a solid content ratio of 95: 5 to 5:95 is preferable. If such a clear paint is used, the antifouling property on the coating film surface can be enhanced without impairing the effects of the present invention.
In the application of the clear paint or the water repellent, for example, a coating instrument such as a spray, a roller, or a brush can be used. These coating amounts may be appropriately set within a range not impairing the effects of the present invention, but are usually about 0.01 to 0.5 kg / m ² .

  In the present invention, various joint patterns can be formed by using joint materials. In this case, for example, the coating can be performed by a method as shown in FIG. In the method shown in FIG. 1, a joint material is first applied to a base material (a), a moisture absorbing / releasing coating material is applied (b), the joint material is removed (c), and then a narrow joint material is applied. After applying (d) and applying the moisture-permeable coating material (e), the narrow joint material is removed (f). According to such a method, the joint part side surface can be covered with the moisture-permeable coating film, and the re-release of harmful gas and the like can be reliably prevented.

  Examples are given below to clarify the features of the present invention.

Example 1
By uniformly stirring and mixing 200 parts by weight of binder A, 600 parts by weight of hygroscopic particles, 650 parts by weight of aggregate A, 3 parts by weight of a film-forming aid, and 600 parts by weight of water, a hygroscopic coating material is obtained. 1 was produced. The moisture absorption / release amount of the coating film (dry thickness 1.5 mm) of the moisture-absorbing / releasing coating material 1 was measured according to the procedure of JIS A6909: 2003 “Finish for architectural coating” 7.32.2, and found to be 230 g / m. ² .

Further, 200 parts by weight of binder B, 1150 parts by weight of aggregate B, 40 parts by weight of chemical adsorbent, 10 parts by weight of photocatalytic substance, 8 parts by weight of film-forming aid, and 800 parts by weight of water are uniformly stirred and mixed. A moisture-permeable coating material 1 was produced. The water vapor permeability of the moisture permeable coating material 1 (dry thickness 2.0 mm) was measured according to JIS K5400: 1990 “Paint General Test Method” 8.17, and was 768 g / m ² · 24 h.

The following raw materials were used in the production of the moisture-absorbing / releasing coating material and the moisture-permeable coating material.
Binder A: acrylic resin emulsion (glass transition temperature 0 ° C., solid content 50% by weight, average particle size 130 μm)
Binder B: Crosslinkable acrylic resin emulsion (glass transition temperature 15 ° C., solid content 50% by weight, crosslinkable reactive group: carboxyl group / epoxy group, average particle size 120 μm)
-Hygroscopic powder: Boehmite (average particle size 150 μm, moisture absorption 35%)
-Aggregate A: Silica sand (average particle size 120μm)
Aggregate B: colored silica sand (average particle size 120 μm)
・ Chemical substance adsorbent: Amine composite layered zirconium phosphate (average particle size 45μm)
Photocatalytic substance: anatase type titanium oxide (average particle size 0.02 μm)
Film-forming aid: 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate

(1) Humidity control performance The hygroscopic coating material 1 is troweled on the surface of a gypsum board (300 × 300 mm) so that the dry film thickness is 1.5 mm, and the standard condition (temperature 23 ° C., relative humidity 50 %) For 24 hours, and then applied with a trowel so that the moisture-permeable coating material 1 has a dry film thickness of 2.0 mm. Next, after curing for 12 days in a standard state, the back and side surfaces were sealed with an epoxy resin, and allowed to stand for 48 hours in a constant temperature and humidity chamber at a temperature of 23 ° C. and a relative humidity of 45%.
With respect to the test plate obtained by the above method, the moisture absorption and desorption amount was measured according to JIS A6909: 2003 “finishing coating material for construction” 7.32 “moisture absorption and desorption property test”.

(2) Adsorbing and decomposing performance of harmful gas On the surface of an aluminum plate (150 × 70 mm) that has been subjected to a sealer treatment in advance, the moisture absorbing / releasing coating material 1 is troweled so that the dry film thickness is 1.5 mm, After drying for 24 hours in a standard state, the moisture-permeable coating material 1 was applied with a trowel so that the dry film thickness was 2.0 mm. After curing for 14 days in the standard state, the side surfaces were sealed with aluminum adhesive tape.
The sample obtained by the above method was put in a 3 liter odor bag, and wet air (23 ° C., 90% RH) in which formaldehyde (20 ppm) was diffused was filled in this odor bag and sealed. After 30 minutes, the formaldehyde concentration in the odor bag was measured using a detector tube, and the decomposition rate was determined by the following formula.
Degradation rate (%) = [(initial formaldehyde concentration−formaldehyde concentration after test) / initial formaldehyde concentration] × 100

(3) Prevention of re-release of harmful gas The sample after the test in (2) above was put in a new 3-liter sachet, filled with dry air (23 ° C., 45% RH) and sealed. After the sachet was heated for 24 hours under the condition of 50 ° C., the formaldehyde concentration in the sachet was measured using a detector tube to confirm the re-release of formaldehyde. In the evaluation, a case where re-release of formaldehyde was not recognized was evaluated as “◯”, and a case where re-release was recognized as “×”.

(4) Degradation performance of pollutants The surface of an aluminum plate (150 × 70 mm) that has been previously treated with a sealer is troweled with a hygroscopic coating material 1 so that the dry film thickness is 1.5 mm, and is in a standard state After drying for 24 hours, the moisture-permeable coating material 1 was applied with a trowel so that the dry film thickness was 2.0 mm. After curing for 14 days in the standard state, the side surfaces were sealed with aluminum adhesive tape. This sample was put in a 20 L container provided with a vent, and 10 cigarettes were ignited and burned, and then the vent was closed and left for 24 hours. Thereafter, the sample was taken out, and the surface of the sample was irradiated with an ultraviolet lamp for 24 hours to confirm the state after irradiation. Evaluation was performed by measuring the degree of yellowing (Δb) before and after the test with a color difference meter.

(Comparative Example 1)
The hygroscopic coating material 2 was produced by uniformly stirring and mixing 200 parts by weight of the binder A, 1200 parts by weight of the aggregate A, 3 parts by weight of the film-forming aid, and 300 parts by weight of water. The moisture absorption / release amount of the coating film (dry thickness 1.5 mm) of the moisture-absorbing / releasing coating material 2 was measured according to the procedure of JIS A6909: 2003 “Finish for architectural coating” 7.32.2. ² .
The test was performed in the same manner as in Example 1 except that the hygroscopic coating material 2 was used instead of the hygroscopic coating material 1.

(Comparative Example 2)
The moisture-permeable coating material 2 was produced by uniformly stirring and mixing 200 parts by weight of the binder B, 1200 parts by weight of the aggregate B, 8 parts by weight of the film-forming aid, and 800 parts by weight of water. The water vapor permeability of the coating film (dry thickness 2.0 mm) of the moisture-permeable coating material 2 was measured according to JIS K5400: 1990 “Paint General Test Method” 8.17, and was 700 g / m ² · 24 h.
A test was performed in the same manner as in Example 1 except that the moisture-permeable coating material 2 was used instead of the moisture-permeable coating material 1.

It is a figure which shows an example of the coating finishing method using a joint material.

Explanation of symbols

1: Base material 2: Joint material 3: Hygroscopic coating material 4: Moisture permeable coating material

Claims (2)

After applying a moisture absorbing / releasing coating material that forms a coating film with a moisture absorption / release amount of 60 g / m ² or more to the base material of the interior surface of the building, the binder is 100 parts by weight in terms of solid content and the average particle size is 0 100 to 4000 parts by weight of aggregate of 0.1 to 5 mm, 0.1 to 100 parts by weight of chemical adsorbent, and 0.1 to 50 parts by weight of photocatalytic substance , water vapor permeability of 100 g / m ² · 24 h or more A paint finishing method for an interior surface of a building, comprising applying a moisture-permeable coating material that forms a coating film having a thickness of 0.2 to 5 mm . The moisture-absorbing / releasing coating material contains 100 parts by weight of a binder in solid content and 20-2000 parts by weight of moisture-absorbing / releasing powder particles, The method for finish-painting a building interior surface according to claim 1, .

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